Requirements:
- This feature will only work from an email address associated with an enabled fax account in our system.
Addressing the Email
- Using any mail client such as Outlook or Gmail, compose a message. To find your sender address, please contact ColTech Voice at support@coltechvoice.com. The full email address should appear as 11digitnumber@fax.coltechvoice.com. For example, 15556667777@fax.coltechvoice.com.” It is important to always include the full 11 digits for faxing any number in the US or Canada.

Including a Cover Page
- Native fax will automatically use the body from your email and populate it onto a cover page.
- You will notice that the To: field on the cover page is populated with the destination fax number by default. The From field, will be the email/fax sender’s full name. The subject the subject you put in the email subject field.
Below is a sample fax cover
Attachments
- When sending a fax from the email you can attach multiple documents types (see below). You can attach a single document or multiple documents (varying formats is fine) and they will be rendered, converted to a faxable format, and sent to your destination fax number. Once your documents are attached, simply hit SEND. That’s it! We’ll take care of the rest.
NOTE: Fax Email-to-Fax total documents file size limit is 10MB after conversion. If the fax you’re sending exceeds the file size limit, you will receive a non-deliverable or NDR message in your email inbox similar to the one below.

Allowed Email Attachments:
- Image Files (TIFF, GIF, PNG, JPEG)
- Adobe Acrobat Files (PDF)
- Microsoft Office Files (DOC, DOCX, XLSX, PPTX)
- Text Files (TXT, RTF)
TIP: If you create a file using a scanner or print to file, always choose the option black and white for the output.
